diff --git a/sdk_nnbd/lib/js/_js.dart b/sdk_nnbd/lib/js/_js.dart
index d0d51f6582c..aef7ef90a58 100644
--- a/sdk_nnbd/lib/js/_js.dart
+++ b/sdk_nnbd/lib/js/_js.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// @dart = 2.5
-
 /// Helper library used by `dart:js`.
 ///
 /// This library hides any logic that is specific to the web, and allows us to
diff --git a/sdk_nnbd/lib/js/_js_client.dart b/sdk_nnbd/lib/js/_js_client.dart
index e81821a8496..de255409c8e 100644
--- a/sdk_nnbd/lib/js/_js_client.dart
+++ b/sdk_nnbd/lib/js/_js_client.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// @dart = 2.5
-
 import 'dart:html' show Blob, Event, ImageData, Node, Window, WorkerGlobalScope;
 import 'dart:indexed_db' show KeyRange;
 import 'dart:_js_helper' show patch;
diff --git a/sdk_nnbd/lib/js/_js_server.dart b/sdk_nnbd/lib/js/_js_server.dart
index 8ca6a02e1b7..b941d77c899 100644
--- a/sdk_nnbd/lib/js/_js_server.dart
+++ b/sdk_nnbd/lib/js/_js_server.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// @dart = 2.5
-
 import 'dart:_js_helper' show patch;
 
 @patch